Hello,
Were the catalogs successfully moved to the D drive? Ensure that you have followed the steps as mentioned in the following technote:
Title: How to move the catalogs in Backup Exec 9.x and 10.0 for Windows Servers to a different drive
http://support.veritas.com/docs/264680
Moving the catalogs will not affect the alerts as they are related to several occurznces in backup exec. Are you checking the active alerts tab? If so, it will be seen as empty if there are no current active alerts. Check the alerts history tab and you might see the alerts there.
Revert in case you have further queries on this issue.
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Regards.